Optical filter assembly



FIG. 1 represents a front view of the apparatus of the present invention; the rear part is not part of the claimed invention; and,

FIG. 2 represents a front view in an open position of the apparatus of the present invention; the rear part is not part of the claimed invention.

The broken lines form no part of the claimed invention. 

The ornamental design for a optical filter assembly, as shown and described. 